03/28/2014 11:49 EDT | Updated 05/28/2014 05:59 EDT

GM issues stop-sale order on some Cruze models

General Motors has told its dealers to stop selling some 2013 and 2014 models of its popular Chevrolet Cruze compact cars, but the automaker won't say why.

Dealers receive the stop-sale order in an email on Thursday. So far, no recall has been issued on cars already sold.

Usually, such orders are given to address some safety issue. Stop-sale orders mean dealers must do something to the vehicles before they can be sold.

The move comes just a month after GM recalled 1.6 million older compact cars to fix an ignition switch problem linked to 31 crashes and 12 deaths.

GM has acknowledged it knew about the problem for at least a decade but did not recall the cars until last month.